# OC Root 2nd 3rd PC Gene/Definition OC.20900 Archaea.1513 Euryarchaeota.38363 mer.481 mer:MMINT_04810 Heterodisulfide reductase, subunit A-related polyferredoxin; K03388 heterodisulfide reductase subunit A2 [EC:1.8.7.3 1.8.98.4 1.8.98.5 1.8.98.6]